Talking machine



Jul 30, 1929. H, L, CEDENO 1,722,897

I TALKING MACHINE Fi'led Sept. 15, 1927 2 Sheets-Sheet 1 July 30, 1929.H. L. CEDENO TALKING MACHINE Filed Sept. 15. 1927 2 Sheets-Sheet 4% W .Wm fiw m n W in Tm/T H W 4% Patented July 30, 1929.

UNITED STATES rinmvioenuns LEON cnnnno, or SANTIAGO, CUBA.

TALKING MACHINE.

Application filed September 15, 1927, Serial No. 219,795, and in CubaMay 10, 1927.

This invention relates to talking machines and has for its principalobject the provision of improvements in the construction of machines ofthis type particularly with the end in View of amplifying the soundwaves with more fidelity to the original tones than is done in machinesas constructed up to the present time.

The object of the invention involves amplifying the sound wavesconcurrently by a plurality of similar amplifying devices and thenrecomposing the amplified waves in order that spurious waves ordistortions in tone incident to certain of the sound amplifying meanswill be dampened or nullified by the bringing together of the amplifiedsounds from the several amplifying means so as to reproducesubstantiallyidentically the tone of the original sound.

This object is obtained by means of a sound cabinet of the usualconstruction and dimensions in which is placed a plurality of trumpetsfor amplifying the sound separately and which are connected, two or moreto a single horn whereby the separately amplified sounds are recomposedin the horn, it being desirable to provide a plurality of groups oftrumpets and a number of horns corresponding to the number of thegroups, to each of which the horns of a group are connected.

Other objects of the invention will appear as the following descriptionof an illustrative embodiment thereof proceeds.

In the drawings:

The Figure 1 is a perspective view of the device with the door of thecabinet of same appearing opened,

The Figure 2 is a front elevation which demonstrates separately and indetail a modification of the present invention.

The Figure 8 is a rear elevation, and

The Figure 4 is a vertical section according to lines H of the Figure 3.

Referring now in detail to the several figures the numeral 1 representsa cabinet of usual construction the upper part of which encloses theturntable 5, reproducer 6 and tone arm 4, as in usual constructions, thelower part constituting a sound or resonating chamber.

Toward the front of this lower part or resonating chamber is secured aframe a, best shown in Figure 4, which supports and holds in place thenovel amplifying and recomposing means constituting the presentinvention. Connected to the frame a are horns 2 and 3. These have thegeneral form of truncated pyramids flaring toward the front of thecabinet and having their small bases toward the rear. The dimensions ofthe horn may conveniently follow the dimensions of the cabinet. In thepresent instance the horns are of greater width than height and one isplaced immediately above the other, the front or fiared ends of the hornterminating substantially in the front plane of the talking machine.

The small bases of the horns consist of panels 2 and 3 having apertures12 preferably symmetrically arranged at the sides of said bases and acentral aperture 11. The horns thus constructed, constitute recomposingmeans for the sound waves, the latter being separately amplified by aplurality of trumpets 7 and 8. These trumpets are of tapered form havingtheir small ends communicating by means of apertures 10 with the lowerend of the tone arm 4. The larger or flared ends of the trumpets areconnected to the openings in the panels 2 and 3 of the horns. Thetrumpets are all of the same length and since the horn 2 is above thehorn 3 it is necessary to dispose of the length of the trumpets 7 whichare connected to the horn 2 by bending or convolving them as shown at 7.

The operation of the invention will now be explained. Sounds emanatingfrom the tone arm 4 are separately amplified in the trumpets 7 and 8. Itis practically impossible to obtain mechanical amplification without atleast some distortion or the producing of spurious vibrations whichinterfere with the purity of the delivered tone. However, suchinterfering factors being accidental, they do not occur with the samevibration frequency or of the same quality or concurrently in each ofthe four trumpets. Consequently, when the four amplified sounds areagain thrown together a new amplified tone is recomposed in which thedefects incidental to each individual amplification are dampened ornullified by the beneficient interference produced by each of theamplified tones upon the others.

The recomposition takes place in the horns 2 and 3 where the composedsounds are fun ther amplified and in fact the recomposition is completedust in front of the talking machine where the amplified and rectifiedtones from all the horns mingle.

The central apertures 11 formed in the panels 2 and 3 of the horns placethe horns in communication with the enclosed air space within thecabinet of the talking machine, the resonating properties of which arethus made available.

It is evident that within the principles of constructions beforementioned there is room for other modifications, without departing fromthe spirit of the invention.

I claim:

1. In talking machines, the combination with a tone arm, of a pluralityof trumpets of the same length, said trumpets being installed inside thetone chamber of the machine and in communication with said tone arm, anda plurality of horns also within said tone chamber to each of which morethan one of the trumpets is connected, for recomposing the soundseparately amplified by the trumpets and for further amplifying thesame.

2. In talking machines, the combination with a tone arm, of a pluralityof trumpets of the same length, said trumpets being installed inside thetone chamber of the machine and in communication with said tone arm, anda plurality of horns also within said tone chamber to each of which morethan one of the trumpets is connected, for recomposing the soundseparately amplified by the trumpet and for further amplifying the same,each horn being formed substantially ,as a truncated pyramid having apanel for its smaller base provided with apertures to which the trumpetsare connected.

3. A talking machine as claimed in claim 1, the said horns being formedas truncated pyramids each having a panel for its smaller base, aplurality of amplifying trumpets for each panel and apertures in saidpanel to which said trumpets are connected, afford ends to said tonearm, said trumpets being coordinated in groups and being of the samelength, the trumpets of one group being convolved to dispose the mouthsof said terminals above the mouths of the trumpets of the other grouphorns arranged in said chamber one above the other, each horn having thegeneral form of a truncated pyramid with the smaller base toward saidtrumpets, panels constituting the bases of said pyramids, said panelsbeing provided with apertures, the trumpets of each group beingconnected to the respective horns, through said apertures, said panelsbeing provided with an additional aperture placing said horns in directcommunication with said resonating chamber.

In testimony whereof I have signed my name to this specification.

I-IERMOGENES LEQN CEDENO.

